Reciprocating saws



UNITED STATES PATENT OFFICE.

PEARSON CROSBY, OF NEIV YORK, N. Y.

MANNER OF HANGING RECIPROCATING SAWS.

Specification forming part of Letters Patent No. 25,632, dated October 4, 1859i; Reissued May 25, 1869, No. 3,454.

To aZZ whom it may conccm:

Be it known that I, PEARsoN CROSBY, of the city, county, and State of New York, have invented a new and useful Improve ment in Hanging Reciprocating Saws; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specification, in Which- Figure l, is a side view of a saw with my invention applied to it. Fig. 2, is a front View of ditto. Fig. 3, is a front sectional view of ditto taken in the line Fig. l.

Similar letters of reference indicate corresponding parts in the several figures.

The object of this invention is to hang the saw insuch a manner that the same will be evenly strained, that is to say, be subjected to an equal tension throughout its whole width, or nealy so, the front part near the teeth being strained a trifle in excess to give stiffness to said part 2, and at the same time admit of being adjusted forward as it is worn by guinming on sharpening.

To enable those skilled in the art to fully understand and construct my invention I will proceed to describe Dit.

A, represents a saw of the usual reciprocating kind. This saw has metal strips a, a, secured to each side of it at its ends, said strips extending the whole width of the saw, the upper strips a, having their lower edges inclined or of dove-tailed form and the lower strips a, having their upper edges inclined, see Fig. 2, in which the inclined edges of both the upper and lower strips are shown.

To each end of the saw A, a cap B, is attached. These caps are each formed of two metal plates b, ZJ, of semi-circular or an approximate forrn and of a width somewhat less than the saw. These plates have each a lip c, at their straight edges and these lips fit over the strips a, a', on the saw, the lips having inclined edges corresponding inversely with the inclined strips a, a, and forming a dove-tail lap, as shown clearly in Figs. 2 and 3.

The plates Z), of each cap B, are connected together by rivets oZ, the ends of which are fitted in holes e, in the plates, said holes being countersunk at the inner sides of the plates and countersunk slightly at the outer sides of the plates to allow a head to be formed on the ends of the rivets, as shown clearly in Fig. 3. Around each rivet cZ, a caseor tube f, is placed, said cases or tubes serving as bearings and preventing the lips c, and plates Z), from binding too hard against the saw.

The upper cap B, has a pin g, in its upper part. This pin g, has its ends fitted in holes countersunk at the inner sides of the plates b, b, precisely the same as the holes e, of the rivets eZ. The pin g, secures a shank iron Z1., to the upperI cap, said cap being allowed to turn on said pin as the latter passes loosely through the iron. The iron ZL, passes through the top traverse bar c', of the sash and is secured therein by a key j.

The lower cap B, has a pin Za, in its lower part, said pinalso having its ends fitted in holes that are countersunk at the inner sides of the plates. On the pin 7c, two bars Z, Z, are fitted loosely. The inner edges of the bars Z, are recessed so as to form shoulders m, which catch under the lower traverse bar fn., of the sash, said bar being transversely of' inverted V-forni, as shown clearly in Fig. 1.

Form the above description it will be seen that by driving the key j, in the iron ZL, the saw A, will be strained the two bars Z, Z, of the lower cap B, adjusting themselves firmly to bar n, under the tension of the saw. In consequence of the caps B, extending over a great portion of the width of the saw, the saw will be more equally strained than usual from front to back, and all buckling prevented and as the saw becomes worn by being gummed out or sharpened it may be Inoved forward in the caps B, the latter not binding sufficiently tight to prevent such result. Any proper rake or inclination may be given the saw in consequence of the bars Z, Z, and iron Z1., being fitted loosely on their pins 7c, g, and by having said pins as well as the rivets (Z, fitted in holes that are countersunk at the inner sides of the plates b, said plates are allowed, under the strain to which they are subjected in driving home key j, to adjust themselves vertically to compensate for any variance in the depth of the strips a, a, a', a', so that each lip c, will have a perfect bearing on its strip a, or a. This is an important feature of the invention.

It will be seen that the caps B, are quite narrow and therefore the invention is applicable to gang saws, as the saws may be placed quite closely together.

I do not claim the attaching of caps B, to

a saw by means of lips which are uttaehed to the-caps lit-ting under strips a, a', attached to the saw-for such device has been previously used; but,

I do claim as new and desire to secure by Letters Patent,

1. Connecting the two plates b, b, of the caps B,' by meansfof :rivets ld, and pins. g, lo, the ends of which are fitted in holes counter sunk at the inner sides of the plates to admit of the vertical adjustment of the plates b, for the purpose set forth.

2. I ralso claim..encompassing the rivets d,

of itl-1e ea B, 'by tubes or-eases -,'to form a bearing or the plates Z), an prevent an i undue pressure of the caps against the saw pose set forth.

PEARSON CROSBY. Witnesses t M. M. LIVINGSTON, C. M. HUGHES. 

